Car-spring.



'wsj swss. Patented m m, awn.

' W. RGBMSON.

CAR SPRING. [Application filed Dec. $1, 10965 (mu model.)

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WllZLlAh/l ROBINSON, OF BQSTON, MASSACHUSETTS.

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$lPEt'iIFIdATION forming part of Letters Tat-lent lto, 655,738, dated A"gust 1d, 1900.

Application filed December 31, 1896. Serial No. 617.555 (No model.)

.Zo ctZZ whom it may concern:

Be it known that l, WILLIAM Roomson, a citizen or" the United States,residing at 1305- tor, in the county of Sudoll; and State oflilassachusetts, have invented a new and Im-' proved Cantipring, of which thefollowing is a specification.

The nature of my invention will be clearly understood from thedescription which follows, reference being had to the accompanyingdrawings, which form a partof his speci iication, in which-- Figure 1 isaside elevation, partly in vertical section, of a portion of a car-truckillustrating my invention partly developed. Fig. 2 is a detachedisometric view of the intermediate springsupporting cup. Fig. 3 is a topView, partly in section, of my improvedspring so far as illustrated inFig. 1. Fig. 4 shows the spring fully developed, and Fig. 5 shows Eliei1 ullydevelopedsprin g as applied to a carrue r.

A represents a portion of a car-truck consisting, mainly, of the frame13; the wheel 0, with its journal-box D, adjustably secured to the frameB; the pedestal E,.keeping the box D in proper alinement with referenceto the frame B, and my improved springs F.

The journal-box D is provided with the spring-supporting wings a, andthese wings are provided with the spring cups or receptacles b. Theexterior spring 0 rests upon the bottom I) of the cup Z1 and issupported thereby. The intermediate spring-cup G has its top providedwith the annular flange e, extending outwardly, and its bottom with theannular flange f, extending inwardly. The saidcup G is dropped downinside of the spring c, extending approximately to the bottom of saidspring, the flange e of said cup resting on topof said spring a, asshown. The spring (Z, of less diameter thanthe spring a, is placedwithin the intermediate cup G and rests on the bottom flange f thereof,while the truck-frame B rests on top of the spring (Z, as shown. One ofsaid springs 0 cl is preferably stiffer and offers more resistance tocompression than the other, the outer spring usually being the st'ifierof the two.

The operation is as follows: The load (represented by the frame B) restsdirectly on the lighter springs d, compressing these springs materiallyand giving an easy resilient support to a light load, the heaviersprings c, which directlysnpport the springs d and their load, beingsomewhat compressed. As the load is increased com mensurately with therepression of the spring (Z under a given load will be just twice asgreat as the compression of the spring 0. To illustrate, if we assumethat the distance between the spring-bearing g of the frame B and thetop of the flange e of the cup G is one inch then a load compress ingthe spring (1 one inch will at the same time compress the spring 0 halfan inch, from which it is evident that the'frame B will have to traveldownward one and one-half inches before striking the top of the flange eof the intermediate cup G'. 7

It is evident that evenif the inner and outer springs be made of thesame relative resistance, yettho aggregate length of the two springstogether will give inuchgreater resiliency and ease of riding than aspring the length of onlyone of them could possi bly give.

In Fig. 4 the spring dis provided with the spring cap or bearing g andthe spring 0, with the base-cap or inverted cup 71, which forms abearing for the outer spring a and the check-spring k, as shown. Thespringpost 2', having its head a" countersunk in the cap g, passescentrally through all the springs. The spring-post'i is provided at itslower end with the washer Z, supporting the spring k, and with theadjusting-nuts m below said washer. Thus it will be seen that by meansof the adjusting-nuts 172 any desired initial compression-may beimparted to the springs c d and also to the check-spring k. Further-vmore, in practice the checkspring 7r prevents the sudden and extremerebound of the.

springs o and d and allows only an easy and limited rebound of saidsprings, thus. provonting in a great measure the teetering or a stancetrnding through the orifice n in the bottom of the spring-cups b of thebox. 7

The arrangementof springs shown in Fig. 5 is precisely the same as thatshown in Fig. 4, except that the upper end of the springpost i issecured to the frame B and the upper end of the check-spring k abutsdirectly against the bottom I) of the spring-cup b of the journal-box.

in many car-trucks, especially for electric cars, it is oftenvery'diflicnlt to find room for a satisfactory arrangement of springs toinsure easy riding under varying conditions of load. It will beobserved, therefore, that one important advantage of my springs is thelittle space which they occupy while securing all the varying advantages of light and heavy springs combined.

I have shown my springs as supported directly by the journal-boxes; butit is evident that they may be used in any position in which car-springsare usually placed or wherever these springs may be found useful orsuitable without departing from the spirit of my invention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a cal-spring, the combination, substantially as described, of anouter spring, a second spring extending within said outer spring, aspring-cup extending between said springs, said spring-cup having oneendsuper ported by one of said'springs and its opposite end, in turn,supporting the other spring,

caps or bearings on the respective'free ends of saidsprings, a tensionor checl: spring on the opposite side of one of said caps or bearings,an adj usting 'od passing through all of said springs and means'foradjusting the tension of said springs.

2. In combination,- substantially as detending within said spring a, theintermediscribed, the outer spring 0, the spring cl ex-". 1

ate spring-cup G located within the spring 0 and outside of the springd, said spring-cup resting on one of said springs and supporting theother, each of said springs supporting the load imposed on the free orextreme end of either,caps or bearings g, h on the. free ends of saidsprings the tension or check e adjusting-rod i passing through all ofspring 7.: on the opposite side of the bearing the springs, and the adjusting-nut m on the endof the rod iand adapted to impart 'initial- 7tension to said springs.

3. In combination with the trnck-frame and the axle-gear, an outerspring supported by the axle-gear, an intermediate spring-cup supportedby said spring and extending down inside of the same, an inner springpassing down within said spring-cup and supported on the bottom thereof,the truck-frame resting on top of said inner spring, a post or redconnected to said truck-frame and passing down through said springs andaxle-gear, a tension or check spring surrounding the lower end of saidrod and abutting against a plate or bearing of said axle-gear, and a notor device on the lower end of said rod adapted to adj nst the tension ofsaid springs, substantially as described.

WILLIAM BINSON.

\Vitnesses:

H. '1. Convert, C. F. A. SMITH.

